file: allow changing the sample rate when throttle=true

this is dangerous from signal processing perspective and should be used
with caution.
This commit is contained in:
Dimitri Stolnikov 2013-10-20 18:39:17 +02:00
parent c904d26eb4
commit 60120746aa
2 changed files with 24 additions and 8 deletions

View File

@ -26,7 +26,6 @@
#include <gnuradio/io_signature.h>
#include <gnuradio/blocks/file_source.h>
#include <gnuradio/blocks/throttle.h>
#include "file_source_c.h"
@ -73,19 +72,21 @@ file_source_c::file_source_c(const std::string &args) :
if (_freq < 0)
throw std::runtime_error("Parameter 'freq' may not be negative.");
if (0 == _rate)
if (0 == _rate && throttle)
throw std::runtime_error("Parameter 'rate' is missing in arguments.");
_file_rate = _rate;
gr::blocks::file_source::sptr src = \
gr::blocks::file_source::make( sizeof(gr_complex),
filename.c_str(),
repeat );
if (throttle) {
gr::blocks::throttle::sptr throttle = gr::blocks::throttle::make( sizeof(gr_complex), _rate );
_throttle = gr::blocks::throttle::make( sizeof(gr_complex), _file_rate );
connect( src, 0, throttle, 0 );
connect( throttle, 0, self(), 0 );
if (throttle) {
connect( src, 0, _throttle, 0 );
connect( _throttle, 0, self(), 0 );
} else {
connect( src, 0, self(), 0 );
}
@ -104,7 +105,8 @@ std::vector<std::string> file_source_c::get_devices()
{
std::vector<std::string> devices;
std::string args = "file='/path/to/your/file',rate=1e6,freq=100e6,repeat=true,throttle=true";
std::string args = "file='/path/to/your/file'";
args += ",rate=1e6,freq=100e6,repeat=true,throttle=true";
args += ",label='Complex Sampled (IQ) File'";
devices.push_back( args );
@ -120,13 +122,24 @@ osmosdr::meta_range_t file_source_c::get_sample_rates( void )
{
osmosdr::meta_range_t range;
range += osmosdr::range_t( get_sample_rate() );
range += osmosdr::range_t( _file_rate ); /* always return file's original rate */
return range;
}
double file_source_c::set_sample_rate( double rate )
{
if ( _file_rate != rate )
{
std::cerr << boost::format("WARNING: Overriding original sample rate of %g with %g")
% _file_rate % rate
<< std::endl;
}
_throttle->set_sample_rate( rate );
_rate = rate;
return get_sample_rate();
}

View File

@ -21,6 +21,7 @@
#define FILE_SOURCE_C_H
#include <gnuradio/hier_block2.h>
#include <gnuradio/blocks/throttle.h>
#include "source_iface.h"
@ -71,6 +72,8 @@ public:
std::string get_antenna( size_t chan = 0 );
private:
gr::blocks::throttle::sptr _throttle;
double _file_rate;
double _freq, _rate;
};